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Weaker yuan deals Asia's casinos a losing hand

Asian travel hotspots may be counting on an ever-growing horde of Chinese tourists for growth, but China's move last week to weaken the yuan may choke off the flow of travelers.

"China's high growth in outbound travel was partially due to a strong renminbi and lower tax in overseas countries," Deutsche Bank (XETRA:DBK-DE) warned in a note last week.

"Although travel agencies may bear the higher costs in the short term, we think persistent renminbi devaluation would lead to more expensive outbound packages, which would in turn slow down the explosive growth in outbound travel."

Read More China's big-spending tourists pause at stores as yuan drops

In a move that rattled global markets, the People's Bank of China (PBOC) allowed the yuan - the units of the currency known as the renminbi (Exchange:CNY=) - to weaken a total of around 3 percent against the U.S. dollar on Tuesday, Wednesday and Thursday amid a shift toward a "managed float" regime. The PBOC set Friday's fixing at a slightly stronger level, which may signal the string of aggressively weaker fixings is finished for now.

But that yuan move may be enough to snuff out Chinese wanderlust, or at least prompt tourists to rein in their overseas shopping jaunts around Asia.

The sheer number of Chinese travelers, as well as the growth in numbers, involved is huge. In the first half of this year, China had around 61.9 million outbound tourists, according to the independent research agency China Outbound Tourism Research Institute, up 12.1 percent from the same period in 2014. Last year, CLSA forecast that the number of mainlanders traveling abroad was expected to hit a whopping 200 million per year by 2020.

"If Chinese outbound tourism growth slows, it could deliver a major hit to the Hong Kong, Korea, Taiwan, and Thailand tourism sectors since Chinese tourists account for 20-80 percent of arrivals in these economies," Credit Suisse (Swiss Exchange: CSGN-CH) said in a note last week.

The risk is especially high in Thailand, where tourism is expected to drive around two-thirds of gross domestic product (GDP) growth this year?, the Credit Suisse said, citing data showing around 20 percent of the country's tourists are from China.

Hong Kong may take an even bigger hit as Chinese tourists account for nearly 80 percent of the city's tourist arrivals, according to data from Credit Suisse.

Read More China's yuan depreciation could hit domestic firms

"A weaker renminbi would narrow the 'discount' Chinese tourists get when purchasing merchandise in Hong Kong," one of the city's key attractions for mainland travelers, Christiaan Tuntono, an analyst at Credit Suisse, said in a separate note last week. "In addition, easier visa approval for competing destinations such as Korea, Japan, Europe and the sharp depreciation of their currencies are also detrimental to Hong Kong's appeal on a comparative basis."